The pair were inseparable. Bacall even brought Sophie to the set of Birth, which she starred in 10 years ago.

Jacqui Kaese, an acting coach who worked with a child star on the film, lasy week recalled how it was Sophie that received the most respect on set.

"Betty never went anywhere without that dog," she told The Times Colonist, a Canadian newspaper, adding that the actress would laugh when Sophie played with her own toy dog. "That dog was royalty."

Her will also includes the sum of $15,000 left to Isla Hernandez, her maid for the past 14 years.

Bacall was known as a dog lover throughout her life. "I was always a dog yearner. I didn't have a dog growing up in the city with a working mother. As an only child, I yearned for someone to talk to," she told the actress Glenn Close in an interview.

Born Betty Jane Perske in the Bronx, she was raised by her divorced mother before finding fame at the age of 19 in To Have And Have Not, alongside her future husband. At a time when many young starlets were nothing more than studio fodder she defined a new type of actress, turning down roles that did not interest her.

Bacall was best known for the films she made with her husband, Humphrey Bogart, during what became known as Hollywood's golden age.

Her movies included The Big Sleep, How to Marry a Millionaire, Key Largo and The Mirror has Two Faces, for which she won a Golden Globe was nominated for an Academy Award.

Her fortune was built up from decades in the film industry, her marriage to Bogart, a respected art collection and her home in Manhattan's Upper West Side.